Fireplace insert



FIG. 1 is a front perspective view of a fireplace insert showing my new design;

FIG. 2 is a right rear perspective view thereof;

FIG. 3 is a left rear perspective view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right end elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a front perspective view thereof with the door open. 

The ornamental design for a fireplace insert, as shown. 